I just can't stress enough how important it is to understand the "NOTES" from this page... > Source:

"Note: Climbing in Patagonia is still wild and remote. Helicopters are traditionally not available and will not be available anytime soon. Rescue teams are volunteer climbers with recreational climbing experience. There is no professional rescue in El Chalten. The chance that a volunteer rescue team will successfully climb to an injured climber and evacuate them off the mountain is extremely slim. Self rescue, if at all possible, is the only option for a successful outcome."

It goes without saying that this maybe the case in many areas/situations...